Alert archive / North Carolina / Flash Flood Warnings in 2009

Flash Flood Warning 40, NWS Greenville-Spartanburg, SC

September 20, 2009Henderson County, Polk County, North Carolina

NWS Greenville-Spartanburg, SC issued this flash flood warning at Sep 20, 2009, 12:40 AM EDT for Henderson County, Polk County, North Carolina. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Sep 20, 2009, 12:40 AM EDT (04:40 UTC)
Expired
Sep 20, 2009, 3:30 AM EDT
In force
3 hr
Issued by
NWS Greenville-Spartanburg, SC
Area
Storm-based polygon
Flood severity
None

Counties Henderson County, NC, Polk County, NC

The radar

The Greer radar (KGSP), 48 km from the middle of the area, began a volume at 04:43 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 4.7 hours before the alert went out and 294 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Peachtre/Fal Fld, GA at 00:00Z on 2009-09-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1577 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Peachtre/Fal Fld, GA at 00:00Z on 2009-09-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 70 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1577 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
548 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
70 m²/s²
0-3 km storm-relative helicity
177 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Greenville-Spartanburg, SC wrote its last area forecast discussion before this flash flood warning went out at Sep 19, 10:04 PM EDT, 2 hours 36 minutes earlier.

Area forecast discussion, Sep 19, 10:04 PM EDT, 2 hours 36 minutes before
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Hazardous weather outlook, Sep 19, 9:57 PM EDT, 2 hours 43 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
957 PM EDT SAT SEP 19 2009

GAZ010-017-018-026-028-029-NCZ033-048>053-058-059-062>065-501>510-
SCZ001>007-010-210200-
RABUN-HABERSHAM-STEPHENS-FRANKLIN-HART-ELBERT-AVERY-MADISON-YANCEY-
MITCHELL-SWAIN-HAYWOOD-BUNCOMBE-GRAHAM-NORTHERN JACKSON-MACON-
SOUTHERN JACKSON-TRANSYLVANIA-HENDERSON-CALDWELL MOUNTAINS-
GREATER CALDWELL-BURKE MOUNTAINS-GREATER BURKE-MCDOWELL MOUNTAINS-
EASTERN MCDOWELL-RUTHERFORD MOUNTAINS-GREATER RUTHERFORD-
POLK MOUNTAINS-EASTERN POLK-OCONEE MOUNTAINS-PICKENS MOUNTAINS-
GREENVILLE MOUNTAINS-GREATER OCONEE-GREATER PICKENS-
GREATER GREENVILLE-SPARTANBURG-ANDERSON-
957 PM EDT SAT SEP 19 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST GEORGIA...WESTERN
NORTH CAROLINA AND UPSTATE SOUTH CAROLINA.

.DAY ONE...TONIGHT.

THE POTENTIAL FOR NUMEROUS TO WIDESPREAD SHOWERS WILL REMAIN INTO
THE OVERNIGHT HOURS...WITH LOCALLY HEAVY RAIN AN ONGOING THREAT...
ESPECIALLY ACROSS FAR NORTHEAST GEORGIA...THE NORTHWEST UPSTATE
AND THE SOUTHERN NORTH CAROLINA MOUNTAINS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

NONE.

NCZ035>037-056-057-068>072-082-SCZ008-009-011>014-019-210200-
ALEXANDER-IREDELL-DAVIE-CATAWBA-ROWAN-CLEVELAND-LINCOLN-GASTON-
MECKLENBURG-CABARRUS-UNION NC-CHEROKEE-YORK-ABBEVILLE-LAURENS-
UNION SC-CHESTER-GREENWOOD-
957 PM EDT SAT SEP 19 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PIEDMONT NORTH
CAROLINA...WESTERN NORTH CAROLINA AND UPSTATE SOUTH CAROLINA.

.DAY ONE...TONIGHT.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

NONE.

The office that day

Everything else NWS Greenville-Spartanburg, SC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 20, 12:05 AM EDTAreal Flood AdvisoryGSPHenderson, Polk115 min
Sep 20, 2:14 AM EDTAreal Flood AdvisoryGSPTransylvania106 min
Sep 20, 3:30 AM EDTFlash Flood WarningGSPHenderson, Polk, Rutherford3 hr
Sep 20, 3:41 AM EDTAreal Flood AdvisoryGSPJackson109 min
Sep 20, 4:30 AM EDTFlash Flood WarningGSPHenderson, Jackson, Macon, Transylvania4 hr
Sep 20, 6:19 AM EDTAreal Flood WarningGSPHenderson, Polk, Rutherford4 hr
Sep 20, 7:28 AM EDTRiver Flood WarningGSPHenderson, Transylvania4 days
Sep 20, 8:14 AM EDTAreal Flood WarningGSPHenderson, Jackson, Macon, Transylvania4 hr
Sep 20, 11:59 AM EDTAreal Flood WarningGSPHenderson, Jackson, Macon, Polk, Transylvania6 hr
Sep 20, 5:32 PM EDTAreal Flood WarningGSPJackson, Macon3 hr
Sep 20, 6:19 PM EDTFlood WatchGSPAvery, Buncombe, Graham, Haywood, Henderson, Jackson and 9 more36 hr
Sep 20, 6:07 AM EDTFlash Flood WarningGSPOconee3 hr
Sep 20, 9:34 AM EDTAreal Flood AdvisoryGSPHabersham56 min
Sep 20, 10:28 AM EDTAreal Flood AdvisoryGSPStephens62 min
Sep 20, 10:39 AM EDTFlash Flood WarningGSPStephens3 hr
Sep 20, 2:31 PM EDTAreal Flood WarningGSPStephens3 hr

Nearby

Flash Flood Warnings in North Carolina, 2009Every flash flood warning in 2009

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.